B.I.L.L.Y. M.A.Y.S.

The Big Insolent Large Loathsome Yellow Malevolent Atrocious Yucky Striker (B.I.L.L.Y. M.A.Y.S.) is a blimp with 200,000 HP that will first spawn on either Round 275, 300, 315, or 320 (it will be one of the four listed rounds, is randomized every time). It will reappear either every 250, 300, 315, or 320 rounds later (it will be one of the four listed round intervals, and again, is randomized every time.) It moves at the same speed as the P.I.N.G.A.S., and also possesses the same immunities as it. It resembles a BAD with Billy Mays on it.

Abilities
It only has one ability, but this one ability is quite game-changing.

But wait, there's more: This has one of four effects.

Effect one: It will either spawn 3 more P.I.N.G.A.S. blimps, G.A.L.E.E.M. blimps, D.H.A.R.K.O.N. blimps, or P.H.I.L. S.W.I.F.T. blimps, providing it spawns on Round 275, 300, 315, or 320 respectively (and rounds they will reappear on).

Effect two: It will give the aforementioned blimps more health (if said blimps are at least at half health)

Effect three: It will give itself more health (if it's at least at half health)

Effect four: It will boost the damage output of the attacks of the blimps, thus enabling them to do more damage.

Each of these effects can only be used a minimum of 1 time, and a maximum of 5 times.

Trivia
Quite obviously, this is a reference to the "but wait, there's more" meme.