diff --git a/src/server/services/round-engine.ts b/src/server/services/round-engine.ts
index 2bb0a7d..da6afb9 100644
--- a/src/server/services/round-engine.ts
+++ b/src/server/services/round-engine.ts
@@ -232,7 +232,13 @@ export async function activateRound(
             id: true,
             mentorId: true,
             mentor: { select: { name: true, email: true } },
-            project: { select: { id: true, title: true } },
+            project: {
+              select: {
+                id: true,
+                title: true,
+                teamMembers: { select: { user: { select: { name: true, email: true } } } },
+              },
+            },
           },
         })
         const perMentor = new Map<
@@ -241,7 +247,7 @@ export async function activateRound(
             email: string | null
             name: string | null
             assignmentIds: string[]
-            projects: { id: string; title: string }[]
+            projects: { id: string; title: string; teamMembers: { name: string | null; email: string }[] }[]
           }
         >()
         for (const a of pendingAssignments) {
@@ -253,7 +259,13 @@ export async function activateRound(
             projects: [],
           }
           bucket.assignmentIds.push(a.id)
-          bucket.projects.push({ id: a.project.id, title: a.project.title })
+          bucket.projects.push({
+            id: a.project.id,
+            title: a.project.title,
+            teamMembers: a.project.teamMembers
+              .filter((tm) => tm.user?.email)
+              .map((tm) => ({ name: tm.user.name, email: tm.user.email })),
+          })
           perMentor.set(a.mentorId, bucket)
         }
         for (const bucket of perMentor.values()) {
@@ -336,8 +348,13 @@ export async function activateRound(
             })
           }
 
+          const allMembers = p.teamMembers
+            .filter((tm) => tm.user?.email)
+            .map((tm) => ({ name: tm.user.name, email: tm.user.email }))
+
           for (const [email, { name }] of recipients) {
-            await sendTeamMentorIntroductionEmail(email, name, p.title, p.id, mentors)
+            const teammates = allMembers.filter((m) => m.email !== email)
+            await sendTeamMentorIntroductionEmail(email, name, p.title, p.id, mentors, teammates)
           }
 
           // Stamp every mentor-assignment row so re-activation doesn't re-send.