Elder Shrooboid is the fifth boss of the game Mario & Luigi: Partners in Time. He defeats Toadbert and Kylie Koopa and takes the Cobalt Star Shard that Toadbert had offscreen. When Mario, Luigi, and the babies arrive after rubbing the stains off Toadbert's drawing, the Elder Shrooboid angrily storms in turning both Toadbert and Kylie into Shroob Mushrooms. He then tries to kill Mario, Luigi, Baby Mario, and Baby Luigi in hopes of stealing the 4 Cobalt Star Shards