To find the new balance in Mark's checking account after the bank charged a $25 fee, you start with his existing balance of -$11 and subtract the fee.
\[ \text{New balance} = -11 - 25 \]
Calculating this gives:
\[ -11 - 25 = -36 \]
So, the balance in the account is \(-$36\).
The final answer is: The balance in the account is \(-36\).