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\parstepwise{\step{One.}\vfill\step{Two.}\vfill\step{Three.}}

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\begin{frame}{Policy Iteration}
\begin{block}{Two step algortithm}
\begin{enumerate}
 \item \textbf{\emph{Policy evaluation:}}\\Calculate the utility $U_i$ of each state based on $\pi_{i}$
 \item \textbf{\emph{Policy improvement:}}\\Calculate a new policy $\pi_{i+1}$ based on $U_i$
\end{enumerate}
\end{block}
\parstepwise{\step{One..}\vfill\step{Two.}\vfill\step{Three.}}
\pageTransitionBoxO%FIX
\end{frame}

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\begin{overpic}[width=5cm]{4x3.jpg}
\put(30,60){\tikz[na] \node[coordinate] (t1) {};}
\put(25,15){\tikz[na] \node[coordinate] (t2) {};}
\end{overpic}

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\documentclass{beamer}
\usepackage{texpower}
\usepackage{beamertexpower}
\usetheme{Warsaw}
\begin{document}
\begin{frame}{Policy Iteration}
\begin{block}{Two step algortithm}
\begin{enumerate}
 \item \textbf{\emph{Policy evaluation:}}\\Calculate the utility $U_i$ of each state based on $\pi_{i}$
 \item \textbf{\emph{Policy improvement:}}\\Calculate a new policy $\pi_{i+1}$ based on $U_i$
\end{enumerate}
\end{block}
\parstepwise{\step{One..}\vfill\step{Two.}\vfill\step{Three.}}
\pageTransitionBoxO%FIX
\end{frame}
\end{document}