Whisper. ( TMNT fanfic )

Donnie wakes up to another boring day. Every since they destroyed TCRI, the Kraang have been on the down low. Before Donnie could enjoy some peace, though, he starts hearing things. Just whispers at first until he sees it, a strange entity. It begs for Donnie's help but what can HE do? Ever since that day Donnie's felt off. Maybe helping this thing will shake this strange feeling off of him. Little does he know the dangers yet to come.

Can the other brothers save Donatello before he loses himself completely?