Jean Grey (Cosmic Force) is an unplayable 5-star boss character. She first appeared in the third anniversary Boss Rush event. Her appearance was the same as the second form of Jean Grey (Phoenix).
Rising Fire[]
POWER COST 
0
(PASSIVE) At the start of Jean's turn, convert 5 random tiles to red. If there are more than 9 red tiles afterwards, destroy them dealing damage and earning AP.
Mind Crush[]
POWER COST 
20
Jean Grey deals xxxxx damage to the target and destroys 4 AP in 3 of the enemy's AP pools.
Merciless Flames[]
POWER COST 
0
(PASSIVE) Whenever Phoenix makes a Match-5, stun a random enemy for 3 turns and deal xxxxx damage to the enemy team.
Phoenix cannot be stunned or sent airborne.